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Internal Friction and Dynamic Modulus in High Temperature Ru-Nb Shape Memory Intermetallics

Published online by Cambridge University Press:  16 January 2013

Laura Dirand ,
Maria L. Nó ,
Karine Chastaing ,
Anne Denquin  and
Jose San Juan
Laura Dirand
Affiliation:
Dpt. Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain.
Maria L. Nó
Affiliation:
Dpt. Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain.
Karine Chastaing
Affiliation:
ONERA (DMMP), 29 avenue de la Division Leclerc, F-92322 Châtillon Cedex, France.
Anne Denquin
Affiliation:
ONERA (DMMP), 29 avenue de la Division Leclerc, F-92322 Châtillon Cedex, France.
Jose San Juan
Affiliation:
Dpt. Física Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain.
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Abstract

Nowadays, aeronautic and aerospace are the more demanding sectors for shape memory alloys (SMA) after the bio-medical one. In particular the interest has been recently focused on very high temperature SMA, which would be able of working as sensors and actuators in the hot areas of the engines and exaust devices.

In the present work we undertook a study of the Ru-Nb SMA Intermetallics, which undergo two succesive martensitic transformations around 1050 K and 1180 K respectively, depending on composition. This study has been focused on measurements of internal friction spectra and dynamic modulus variation up to 1700 K, which have been carried out in a sub-resonant torsion mechanical spectrometer.

The internal friction and dynamic modulus have been studied as a function of the heating-cooling rate and the frequency in order to compare experimental behaviour with theoretical models for martensitic transformations. In addition to the internal friction peaks linked to both martensitic transformations we have also observed a complex relaxation process around 950 K, which seems to be linked to the interaction of the martensite interfaces with structural defects. An analysis and discusion of the potential microscopic mechanisms are also presented.

Keywords

internal frictionphase transformationmemory
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 235 - 240
Copyright
Copyright © Materials Research Society 2012 

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